R600/SI: Use SGPR_(32|64) reg clases when lowering SI_ADDR64_RSRC
R600/SI: Use SGPR_(32|64) reg clases when lowering SI_ADDR64_RSRC

The SReg_(32|64) register classes contain special registers in addition
to the numbered SGPRs.  This can lead to machine verifier errors when
these register classes are used as sub-registers for SReg_128, since
SReg_128 only uses the numbered SGPRs.

Replacing SReg_(32|64) with SGPR_(32|64) fixes this problem, since
the SGPR_(32|64) register classes contain only numbered SGPRs.

Tests cases for this are comming in a later commit.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@204474 91177308-0d34-0410-b5e6-96231b3b80d8

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