[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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230794 91177308-0d34-0410-b5e6-96231b3b80d8

test/Bitcode/use-list-order.ll

@@ -79,13 +79,13 @@ entry:
 
 define i1 @loadb() {
 entry:
-  %b = load i1* @b
+  %b = load i1, i1* @b
   ret i1 %b
 }
 
 define i1 @loada() {
 entry:
-  %a = load i1* getelementptr ([4 x i1]* @a, i64 0, i64 2)
+  %a = load i1, i1* getelementptr ([4 x i1]* @a, i64 0, i64 2)
   ret i1 %a
 }
 
@@ -115,7 +115,7 @@ first:
 
 define i4 @globalAndFunctionFunctionUser() {
 entry:
-  %local = load i4* @globalAndFunction
+  %local = load i4, i4* @globalAndFunction
   ret i4 %local
 }