[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/ldm-merge-struct.ll b/llvm/test/CodeGen/Thumb/ldm-merge-struct.ll
index 2f732e0..9136f05 100644
--- a/llvm/test/CodeGen/Thumb/ldm-merge-struct.ll
+++ b/llvm/test/CodeGen/Thumb/ldm-merge-struct.ll
@@ -11,8 +11,8 @@
 ; CHECK-LABEL: f:
 ; CHECK: ldm r[[BASE:[0-9]]],
 ; CHECK-NEXT-NOT: subs r[[BASE]]
-  %0 = load i32* getelementptr inbounds (%struct.S* @s, i32 0, i32 0), align 4
-  %1 = load i32* getelementptr inbounds (%struct.S* @s, i32 0, i32 1), align 4
+  %0 = load i32, i32* getelementptr inbounds (%struct.S* @s, i32 0, i32 0), align 4
+  %1 = load i32, i32* getelementptr inbounds (%struct.S* @s, i32 0, i32 1), align 4
   %cmp = icmp sgt i32 %0, %1
   %2 = sub i32 0, %1
   %cond.p = select i1 %cmp, i32 %1, i32 %2