[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/LoopVectorize/loop-vect-memdep.ll b/llvm/test/Transforms/LoopVectorize/loop-vect-memdep.ll
index 326c4d4..d9efaa5 100644
--- a/llvm/test/Transforms/LoopVectorize/loop-vect-memdep.ll
+++ b/llvm/test/Transforms/LoopVectorize/loop-vect-memdep.ll
@@ -6,7 +6,7 @@
 
 define void @test_loop_novect(double** %arr, i64 %n) {
 for.body.lr.ph:
-  %t = load double** %arr, align 8
+  %t = load double*, double** %arr, align 8
   br label %for.body
 
 for.body:                                      ; preds = %for.body, %for.body.lr.ph
@@ -14,8 +14,8 @@
   %a = getelementptr inbounds double, double* %t, i64 %i
   %i.next = add nuw nsw i64 %i, 1
   %a.next = getelementptr inbounds double, double* %t, i64 %i.next
-  %t1 = load double* %a, align 8
-  %t2 = load double* %a.next, align 8
+  %t1 = load double, double* %a, align 8
+  %t2 = load double, double* %a.next, align 8
   store double %t1, double* %a.next, align 8
   store double %t2, double* %a, align 8
   %c = icmp eq i64 %i, %n