[COMMITTED] Turn of ipa-ra in builtins test (PR91059)

[Wilco Dijkstra]

The gcc.c-torture/execute/builtins/lib directory contains a reimplementation
of many C library string functions, which causes non-trivial register allocation
bugs with LTO and static linked libraries.  To fix this long-standing test 
issue,
turn off ipa-ra which avoids the register corruption across calls.  All builtin
torture tests now pass on aarch64-none-elf.  Committed as obvious.

ChangeLog:
2019-07-08  Wilco Dijkstra  <wdijk...@arm.com>

testsuite/
        PR testsuite/91059
        PR testsuite/78529
        * gcc.c-torture/execute/builtins/builtins.exp: Add -fno-ipa-ra.
--

diff --git a/gcc/testsuite/gcc.c-torture/execute/builtins/builtins.exp 
b/gcc/testsuite/gcc.c-torture/execute/builtins/builtins.exp
index 
fb9d3ece181fee3489e1ddd2f72f40dbbf807bb6..d62f78c7a6c52c3adea5e4c216f12765acadf60e
 100644
--- a/gcc/testsuite/gcc.c-torture/execute/builtins/builtins.exp
+++ b/gcc/testsuite/gcc.c-torture/execute/builtins/builtins.exp
@@ -37,7 +37,7 @@ load_lib c-torture.exp
 torture-init
 set-torture-options $C_TORTURE_OPTIONS {{}} $LTO_TORTURE_OPTIONS
 
-set additional_flags "-fno-tree-dse -fno-tree-loop-distribute-patterns 
-fno-tracer"
+set additional_flags "-fno-tree-dse -fno-tree-loop-distribute-patterns 
-fno-tracer -fno-ipa-ra"
 if [istarget "powerpc-*-darwin*"] {
    lappend additional_flags "-Wl,-multiply_defined,suppress"
 }