[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/Transforms/InstCombine/alias-recursion.ll b/llvm/test/Transforms/InstCombine/alias-recursion.ll
index fa63726..8e53995 100644
--- a/llvm/test/Transforms/InstCombine/alias-recursion.ll
+++ b/llvm/test/Transforms/InstCombine/alias-recursion.ll
@@ -19,6 +19,6 @@
 
 for.end:                                          ; preds = %for.body, %entry
   %A = phi i32 (%class.A*)** [ bitcast (i8** @vtbl to i32 (%class.A*)**), %for.body ], [ null, %entry ]
-  %B = load i32 (%class.A*)** %A
+  %B = load i32 (%class.A*)*, i32 (%class.A*)** %A
   ret i32 (%class.A*)* %B
 }