[Ada] Combine system.ads file - vxworks7 kernel constants.

[Pierre-Marie de Rodat via Gcc-patches]

Systemitize Word_Size and Memory_Size declarations rather than hard code
with numerical values or OS specific Long_Integer size.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * libgnat/system-vxworks7-aarch64.ads (Word_Size): Compute
        based on Standard'Word_Size. (Memory_Size): Compute based
        on Word_Size.
        * libgnat/system-vxworks7-arm.ads: Likewise.
        * libgnat/system-vxworks7-e500-kernel.ads: Likewise.
        * libgnat/system-vxworks7-ppc-kernel.ads: Likewise.
        * libgnat/system-vxworks7-ppc64-kernel.ads: Likewise.
        * libgnat/system-vxworks7-x86-kernel.ads: Likewise.
        * libgnat/system-vxworks7-x86_64-kernel.ads: Likewise.
diff --git a/gcc/ada/libgnat/system-vxworks7-aarch64.ads b/gcc/ada/libgnat/system-vxworks7-aarch64.ads
--- a/gcc/ada/libgnat/system-vxworks7-aarch64.ads
+++ b/gcc/ada/libgnat/system-vxworks7-aarch64.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 64;
-   Memory_Size  : constant := 2 ** 64;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-arm.ads b/gcc/ada/libgnat/system-vxworks7-arm.ads
--- a/gcc/ada/libgnat/system-vxworks7-arm.ads
+++ b/gcc/ada/libgnat/system-vxworks7-arm.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-e500-kernel.ads b/gcc/ada/libgnat/system-vxworks7-e500-kernel.ads
--- a/gcc/ada/libgnat/system-vxworks7-e500-kernel.ads
+++ b/gcc/ada/libgnat/system-vxworks7-e500-kernel.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-ppc-kernel.ads b/gcc/ada/libgnat/system-vxworks7-ppc-kernel.ads
--- a/gcc/ada/libgnat/system-vxworks7-ppc-kernel.ads
+++ b/gcc/ada/libgnat/system-vxworks7-ppc-kernel.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-ppc64-kernel.ads b/gcc/ada/libgnat/system-vxworks7-ppc64-kernel.ads
--- a/gcc/ada/libgnat/system-vxworks7-ppc64-kernel.ads
+++ b/gcc/ada/libgnat/system-vxworks7-ppc64-kernel.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 64;
-   Memory_Size  : constant := 2 ** 64;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-x86-kernel.ads b/gcc/ada/libgnat/system-vxworks7-x86-kernel.ads
--- a/gcc/ada/libgnat/system-vxworks7-x86-kernel.ads
+++ b/gcc/ada/libgnat/system-vxworks7-x86-kernel.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-x86_64-kernel.ads b/gcc/ada/libgnat/system-vxworks7-x86_64-kernel.ads
--- a/gcc/ada/libgnat/system-vxworks7-x86_64-kernel.ads
+++ b/gcc/ada/libgnat/system-vxworks7-x86_64-kernel.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 64;
-   Memory_Size  : constant := 2 ** 64;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison