Matt Arsenault 2738ede6b2 AMDGPU: Restore using MRI to find highest used regs ...

If there are no calls, this is a faster path than
searching the entire program for calls.

This was supposed to be left in r309781.
Fixes unused variable warning.

llvm-svn: 309832

2017-08-02 17:15:01 +00:00

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