[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

Essentially the same as the GEP change in r230786.

A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)

import fileinput
import sys
import re

pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")

for line in sys.stdin:
  sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7649

llvm-svn: 230794
diff --git a/llvm/test/CodeGen/PowerPC/lbzux.ll b/llvm/test/CodeGen/PowerPC/lbzux.ll
index 11231e7..4bd9cb6 100644
--- a/llvm/test/CodeGen/PowerPC/lbzux.ll
+++ b/llvm/test/CodeGen/PowerPC/lbzux.ll
@@ -4,7 +4,7 @@
 
 define fastcc void @allocateSpace(i1 %cond1, i1 %cond2) nounwind {
 entry:
-  %0 = load i8** undef, align 8
+  %0 = load i8*, i8** undef, align 8
   br i1 undef, label %return, label %lor.lhs.false
 
 lor.lhs.false:                                    ; preds = %entry
@@ -30,7 +30,7 @@
   %arrayidx49 = getelementptr inbounds i8, i8* %0, i64 %idxprom48139
   %1 = bitcast i8* %arrayidx49 to i16*
   %2 = bitcast i8* %arrayidx18 to i16*
-  %3 = load i16* %1, align 1
+  %3 = load i16, i16* %1, align 1
   store i16 %3, i16* %2, align 1
   br label %return