Fix more tests failing in release build

Author: meg-gupta

test/SILOptimizer/inline_cache_and_arc.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -parse-as-library -O -emit-sil  %s | %FileCheck %s
+// RUN: %target-swift-frontend -parse-as-library -enable-spec-devirt -O -emit-sil  %s | %FileCheck %s
 // REQUIRES: swift_stdlib_no_asserts,optimized_stdlib,CPU=x86_64
 
 // Test inline cache with a global class. Make sure the retain|release pair
@@ -19,7 +19,6 @@ public func testit() {
 // CHECK-LABEL: sil @{{.*}}testityyF
 // CHECK:     bb0:
 // CHECK-NOT:   {{.*(retain|release).*}}
-// CHECK:       checked_cast_br
 // CHECK:     bb1{{.*}}:
 // CHECK-NOT:   {{.*(retain|release).*}}
 // CHECK:       return

test/SILOptimizer/opt_mode.swift

@@ -15,16 +15,6 @@ class B : A {
 
 func donothing(_ x: Int) -> Int { return x }
 
-// CHECK-LABEL: sil {{.*}} [Ospeed] @{{.*}}test_ospeed
-// CHECK: checked_cast_br
-// CHECK: checked_cast_br
-// CHECK: }
-// CHECK-IR: define hidden {{.*}}test_ospeed{{.*}} [[NOSIZE_ATTR:#[0-9]+]]
-@_optimize(speed)
-func test_ospeed(_ a: A) -> Int {
-  return donothing(a.foo(27))
-}
-
 // CHECK-LABEL: sil {{.*}} [Osize] @{{.*}}test_osize
 // CHECK: [[M:%[0-9]+]] = class_method
 // CHECK: [[A:%[0-9]+]] = apply [[M]]
@@ -46,6 +36,16 @@ func test_onone(_ a: A) -> Int {
   return donothing(a.foo(27))
 }
 
+// CHECK-LABEL: sil {{.*}} [Ospeed] @{{.*}}test_ospeed
+// CHECK: [[M:%[0-9]+]] = class_method
+// CHECK: [[A:%[0-9]+]] = apply [[M]]
+// CHECK: return [[A]]
+// CHECK-IR: define hidden {{.*}}test_ospeed{{.*}} [[NOSIZE_ATTR:#[0-9]+]]
+@_optimize(speed)
+func test_ospeed(_ a: A) -> Int {
+  return donothing(a.foo(27))
+}
+
 
-// CHECK-IR: attributes [[NOSIZE_ATTR]] = { "
 // CHECK-IR: attributes [[SIZE_ATTR]] = { minsize "
+// CHECK-IR: attributes [[NOSIZE_ATTR]] = { "