Revert "[APInt] Fix a few places that use APInt::getRawData to operate within the normal API."

This reverts commit r301105, 4, 3 and 1, as a follow up of the previous
revert, which broke even more bots.

For reference:
Revert "[APInt] Use operator<<= where possible. NFC"
Revert "[APInt] Use operator<<= instead of shl where possible. NFC"
Revert "[APInt] Use ashInPlace where possible."

PR32754.

llvm-svn: 301111
diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index 00003b5..cac22af 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -1949,7 +1949,8 @@
     return true;
   StringRef V = S.substr(2);
   APInt A(V.size()*4, V, 16);
-  Result = A.zextOrTrunc(A.getActiveBits());
+  Result = APInt(A.getActiveBits(),
+                 ArrayRef<uint64_t>(A.getRawData(), A.getNumWords()));
   return false;
 }