[AMDGPU][MC] Optimized IsRegIntersect function
[AMDGPU][MC] Optimized IsRegIntersect function

Optimized IsRegIntersect by using MCRegAliasIterator

See Bug 33800: https://bugs.llvm.org//show_bug.cgi?id=33800

Reviewers: arsenm, artem.tamazov

Differential Revision: https://reviews.llvm.org/D35452

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@308294 91177308-0d34-0410-b5e6-96231b3b80d8

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