[x86] Mostly reautogenerate a bunch of tests that affect D37775. NFC

Tests required minor manual tweaks:
CodeGen/MIR/X86/generic-instr-type.mir
CodeGen/X86/GlobalISel/select-copy.mir
CodeGen/X86/GlobalISel/select-ext.mir
CodeGen/X86/GlobalISel/select-intrinsic-x86-flags-read-u32.mir
CodeGen/X86/GlobalISel/select-phi.mir
CodeGen/X86/GlobalISel/select-trunc.mir
CodeGen/X86/GlobalISel/select-frameIndex.mir

And following tests are split into 32/64 versions:
CodeGen/X86/GlobalISel/legalize-GV.mir
CodeGen/X86/GlobalISel/select-frameIndex.mir

llvm-svn: 323209