fix comments

Author: Shoreshen

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -4879,8 +4879,7 @@ getLegalRegBank(const MachineOperand *NewOp, const MachineOperand *RootOp,
 InstructionSelector::ComplexRendererFns
 AMDGPUInstructionSelector::selectVOP3PRetHelper(MachineOperand &Root,
                                                 bool IsDOT) const {
-  MachineRegisterInfo &MRI =
-      Root.getParent()->getParent()->getParent()->getRegInfo();
+  MachineRegisterInfo &MRI = Root.getParent()->getMF()->getRegInfo();
   auto Results = selectVOP3PModsImpl(&Root, MRI, IsDOT);
   const MachineOperand *Op = Results.first;
   unsigned Mods = Results.second;

llvm/test/lit.cfg.py

@@ -473,7 +473,7 @@ def have_cxx_shared_library():
         print("could not exec llvm-readobj")
         return False
 
-    readobj_out = readobj_cmd.stdout.read().decode("ascii")
+    readobj_out = readobj_cmd.stdout.read().decode("utf-8")
     readobj_cmd.wait()
 
     regex = re.compile(r"(libc\+\+|libstdc\+\+|msvcp).*\.(so|dylib|dll)")