[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/ArgumentPromotion/basictest.ll b/llvm/test/Transforms/ArgumentPromotion/basictest.ll
index 8f78b98..89888bb 100644
--- a/llvm/test/Transforms/ArgumentPromotion/basictest.ll
+++ b/llvm/test/Transforms/ArgumentPromotion/basictest.ll
@@ -3,8 +3,8 @@
 
 define internal i32 @test(i32* %X, i32* %Y) {
 ; CHECK-LABEL: define internal i32 @test(i32 %X.val, i32 %Y.val)
-  %A = load i32* %X
-  %B = load i32* %Y
+  %A = load i32, i32* %X
+  %B = load i32, i32* %Y
   %C = add i32 %A, %B
   ret i32 %C
 }