[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/funcptr_cast.ll b/llvm/test/CodeGen/AArch64/funcptr_cast.ll
index a00b7bc..506485e 100644
--- a/llvm/test/CodeGen/AArch64/funcptr_cast.ll
+++ b/llvm/test/CodeGen/AArch64/funcptr_cast.ll
@@ -6,7 +6,7 @@
 ; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, :lo12:foo
 ; CHECK: ldrb w0, [{{x[0-9]+}}]
 entry:
-  %0 = load i8* bitcast (void (...)* @foo to i8*), align 1
+  %0 = load i8, i8* bitcast (void (...)* @foo to i8*), align 1
   ret i8 %0
 }