[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/Thumb/stm-merge.ll b/llvm/test/CodeGen/Thumb/stm-merge.ll
index d4b4cd2..5492ad8 100644
--- a/llvm/test/CodeGen/Thumb/stm-merge.ll
+++ b/llvm/test/CodeGen/Thumb/stm-merge.ll
@@ -18,7 +18,7 @@
   store i32 %x, i32* %i, align 4
   store i32 %y, i32* %h, align 4
   store i32 %z, i32* %g, align 4
-  %.pr = load i32* @d, align 4
+  %.pr = load i32, i32* @d, align 4
   %cmp11 = icmp slt i32 %.pr, 1
   br i1 %cmp11, label %for.inc.lr.ph, label %for.body5