Use the exact bitwidth integer for this test.

Fixes a regression in the test suite introduced in #3347 on 32-bit
architectures.

Author: CodaFi

test/DebugInfo/guard-let.swift

@@ -6,8 +6,8 @@ public func f(_ i : Int?)
   // CHECK: define {{.*}}@_TF4main1fFGSqSi_T_
   // CHECK: %[[PHI:.*]] = phi
   // The shadow copy store should not have a location.
-  // CHECK: store i64 %[[PHI]], i64* %val.addr, align 8, !dbg ![[DBG0:.*]]
-  // CHECK: @llvm.dbg.declare(metadata i64* %val.addr, {{.*}}, !dbg ![[DBG1:.*]]
+  // CHECK: store {{(i32|i64)}} %[[PHI]], {{(i32|i64)}}* %val.addr, align {{(4|8)}}, !dbg ![[DBG0:.*]]
+  // CHECK: @llvm.dbg.declare(metadata {{(i32|i64)}}* %val.addr, {{.*}}, !dbg ![[DBG1:.*]]
   // CHECK: ![[DBG0]] = !DILocation(line: 0,
   // CHECK: ![[DBG1]] = !DILocation(line: [[@LINE+1]],
   guard let val = i else { return }