[PATCH] RISC-V: Fix uninit riscv_subset_list::m_allow_adding_dup issue

[Kito Cheng]

We forgot to initialize m_allow_adding_dup in the constructor of
riscv_subset_list, then that will be a random value...that will lead
to a random behavior of the -march may accpet duplicate extension.

gcc/ChangeLog:

        * common/config/riscv/riscv-common.cc
        (riscv_subset_list::riscv_subset_list): Init m_allow_adding_dup.
---
 gcc/common/config/riscv/riscv-common.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/common/config/riscv/riscv-common.cc 
b/gcc/common/config/riscv/riscv-common.cc
index d3240f79240..2834697a857 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -620,7 +620,7 @@ riscv_subset_t::riscv_subset_t ()
 
 riscv_subset_list::riscv_subset_list (const char *arch, location_t loc)
   : m_arch (arch), m_loc (loc), m_head (NULL), m_tail (NULL), m_xlen (0),
-    m_subset_num (0)
+    m_subset_num (0), m_allow_adding_dup (false)
 {
 }
 
-- 
2.34.1