Fix cc -ftrapping-math on macppc

Handle CALL_RM like CALL for 32-bit ELF. If a function call has the
strictfp attribute, its opcode changes from CALL to CALL_RM. If a
call uses the secure PLT, the

Fix cc -ftrapping-math on macppc

Handle CALL_RM like CALL for 32-bit ELF. If a function call has the
strictfp attribute, its opcode changes from CALL to CALL_RM. If a
call uses the secure PLT, then it must getGlobalBaseReg() to set r30.

After I rebuilt xenocara/lib/pixman with this change, Xorg stopped
crashing on my macppc. pixman uses cc -ftrapping-math which puts
strictfp on each function call.

https://github.com/llvm/llvm-project/pull/72758

ok jca@ tobhe@ deraadt@

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import of llvm from LLVM 16.0.6

Import LLVM 13.0.0 release.

Import LLVM 11.1.0 release including clang, lld and lldb.

Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty