[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/AArch64/arm64-const-addr.ll b/llvm/test/CodeGen/AArch64/arm64-const-addr.ll
index 834e9be..ffc1533 100644
--- a/llvm/test/CodeGen/AArch64/arm64-const-addr.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-const-addr.ll
@@ -11,12 +11,12 @@
 ; CHECK:        ldr w8, [x8, #12]
   %at = inttoptr i64 68141056 to %T*
   %o1 = getelementptr %T, %T* %at, i32 0, i32 1
-  %t1 = load i32* %o1
+  %t1 = load i32, i32* %o1
   %o2 = getelementptr %T, %T* %at, i32 0, i32 2
-  %t2 = load i32* %o2
+  %t2 = load i32, i32* %o2
   %a1 = add i32 %t1, %t2
   %o3 = getelementptr %T, %T* %at, i32 0, i32 3
-  %t3 = load i32* %o3
+  %t3 = load i32, i32* %o3
   %a2 = add i32 %a1, %t3
   ret i32 %a2
 }