Regressions on native/master at commit r17-762 vs commit r17-756 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-762 vs commit r17-756 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.target/i386/stack-usage-realign.c scan-stack-usage main 
`main`\t48\tdynamic,bounded