Move TypeName helper into common DXBC header

renderdoc/driver/shaders/dxbc/dxbc_common.h

@@ -310,6 +310,8 @@ struct CBufferVariableType
   rdcarray<CBufferVariable> members;
 };
 
+rdcstr TypeName(CBufferVariableType::Descriptor desc);
+
 struct CBufferVariable
 {
   rdcstr name;

renderdoc/driver/shaders/dxbc/dxbc_container.h

@@ -130,8 +130,6 @@ enum class GlobalShaderFlags : int64_t
 
 BITMASK_OPERATORS(GlobalShaderFlags);
 
-rdcstr TypeName(CBufferVariableType::Descriptor desc);
-
 struct RDEFHeader;
 
 uint32_t DecodeFlags(const ShaderCompileFlags &compileFlags);