Bob Wilson 2d69fb4184 Avoid modifying the OneClassForEachPhysReg map while iterating over it. ...

Linear scan regalloc is currently assuming that any register aliased with
a member of a regclass must also be in at least one regclass.  That is not
always true.  For example, for X86, RIP is in a regclass but IP is not.
If you're unlucky, this can cause a crash by invalidating the iterator.

llvm-svn: 124365

2011-01-27 07:26:15 +00:00

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