[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/Bitcode/case-ranges-3.3.ll b/llvm/test/Bitcode/case-ranges-3.3.ll
index 020b37f4..eb55ef1 100644
--- a/llvm/test/Bitcode/case-ranges-3.3.ll
+++ b/llvm/test/Bitcode/case-ranges-3.3.ll
@@ -10,7 +10,7 @@
   %1 = alloca i32, align 4
   %2 = alloca i32, align 4
   store i32 %x, i32* %2, align 4
-  %3 = load i32* %2, align 4
+  %3 = load i32, i32* %2, align 4
   switch i32 %3, label %9 [
 ; CHECK: switch i32 %3, label %9
     i32 -3, label %4
@@ -63,6 +63,6 @@
   br label %11
 
 ; <label>:11
-  %12 = load i32* %1
+  %12 = load i32, i32* %1
   ret i32 %12
 }