Remove the -emit-opaque-pointers flag (KhronosGroup#2121)

We no longer need this flag as only opaque pointers are supported now.

Author: svenvh

test/CXX/global-ctor.cl

@@ -2,7 +2,7 @@
 // RUN: llvm-spirv %t.bc -o %t.spv
 // RUN: spirv-val %t.spv
 // RUN: llvm-spirv %t.spv -to-text -o - | FileCheck %s --check-prefix=CHECK-SPIRV
-// RUN: llvm-spirv -r -emit-opaque-pointers %t.spv -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-LLVM
+// RUN: llvm-spirv -r %t.spv -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-LLVM
 // RUN: not llvm-spirv %t.bc --spirv-max-version=1.0 2>&1 | FileCheck %s --check-prefix=CHECK-SPV10
 
 class Something {

test/DebugInfo/BuiltinCallLocation.cl

@@ -3,7 +3,7 @@
 // RUN: %clang_cc1 -triple spir -fdeclare-opencl-builtins -finclude-default-header %s -disable-llvm-passes -emit-llvm-bc -debug-info-kind=line-tables-only -o %t.bc
 // RUN: llvm-spirv %t.bc -spirv-text -o - | FileCheck %s --check-prefix=CHECK-SPIRV
 // RUN: llvm-spirv %t.bc -o %t.spv
-// RUN: llvm-spirv -r -emit-opaque-pointers %t.spv -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-LLVM
+// RUN: llvm-spirv -r %t.spv -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-LLVM
 
 // CHECK-SPIRV: Label
 // CHECK-SPIRV: ExtInst {{.*}} DebugScope