[X86] Change MS inline asm clobber list filter to check for 'fpsr' instead of 'fpsw' after D57641.

Summary: The backend used to print the x87 FPSW register as 'fpsw', but gcc inline asm uses 'fpsr'. After D57641, the backend now uses 'fpsr' to match.

Reviewers: rnk

Reviewed By: rnk

Subscribers: eraman, cfe-commits, llvm-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57642

llvm-svn: 353142