[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/CodeGen/Hexagon/gp-rel.ll b/llvm/test/CodeGen/Hexagon/gp-rel.ll
index 561869e..bb7cb18 100644
--- a/llvm/test/CodeGen/Hexagon/gp-rel.ll
+++ b/llvm/test/CodeGen/Hexagon/gp-rel.ll
@@ -10,14 +10,14 @@
 ; CHECK: r{{[0-9]+}}{{ *}}={{ *}}memw(#a)
 ; CHECK: r{{[0-9]+}}{{ *}}={{ *}}memw(#b)
 ; CHECK: if{{ *}}(p{{[0-3]}}) memw(##c){{ *}}={{ *}}r{{[0-9]+}}
-  %0 = load i32* @a, align 4
-  %1 = load i32* @b, align 4
+  %0 = load i32, i32* @a, align 4
+  %1 = load i32, i32* @b, align 4
   %add = add nsw i32 %1, %0
   %cmp = icmp eq i32 %0, %1
   br i1 %cmp, label %if.then, label %entry.if.end_crit_edge
 
 entry.if.end_crit_edge:
-  %.pre = load i32* @c, align 4
+  %.pre = load i32, i32* @c, align 4
   br label %if.end
 
 if.then: