[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/DeadStoreElimination/free.ll b/llvm/test/Transforms/DeadStoreElimination/free.ll
index bac325e..6b69ec8 100644
--- a/llvm/test/Transforms/DeadStoreElimination/free.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/free.ll
@@ -10,7 +10,7 @@
 ; CHECK-NEXT: @free
 ; CHECK-NEXT: ret void
 define void @test(i32* %Q, i32* %P) {
-        %DEAD = load i32* %Q            ; <i32> [#uses=1]
+        %DEAD = load i32, i32* %Q            ; <i32> [#uses=1]
         store i32 %DEAD, i32* %P
         %1 = bitcast i32* %P to i8*
         tail call void @free(i8* %1)