* Silence bunch of compiler warnings on Silicon Labs platforms

* Remove "ARM" as compiler for Silicon Labs' CM0 platforms
* Define LED3 and LED4 on Silicon Labs platforms

Author: stevew817

libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG_STK3700/TOOLCHAIN_ARM_STD/startup_efm32gg.s

@@ -272,14 +272,6 @@ EMU_IRQHandler
 
 ; User Initial Stack & Heap
 
-                IF      :DEF:__MICROLIB
-
-                EXPORT  __initial_sp
-                EXPORT  __heap_base
-                EXPORT  __heap_limit
-
-                ELSE
-
                 IMPORT  __use_two_region_memory
                 EXPORT  __user_initial_stackheap
 
@@ -293,6 +285,4 @@ __user_initial_stackheap PROC
 
                 ALIGN
 
-                ENDIF
-
                 END

libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_MICRO/startup_efm32hg.s

@@ -195,27 +195,8 @@ TIMER2_IRQHandler
 
 ; User Initial Stack & Heap
 
-                IF      :DEF:__MICROLIB
-
                 EXPORT  __initial_sp
                 EXPORT  __heap_base
                 EXPORT  __heap_limit
 
-                ELSE
-
-                IMPORT  __use_two_region_memory
-                EXPORT  __user_initial_stackheap
-
-__user_initial_stackheap PROC
-                LDR     R0, =  Heap_Mem
-                LDR     R1, =(Stack_Mem + Stack_Size)
-                LDR     R2, = (Heap_Mem +  Heap_Size)
-                LDR     R3, = Stack_Mem
-                BX      LR
-                ENDP
-
-                ALIGN
-
-                ENDIF
-
                 END

libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_STD/efm32hg.sct

@@ -485,7 +485,7 @@ extern "C"
 #define __CLZ __clz
 #endif
 
-#if defined (ARM_MATH_CM0_FAMILY) && ((defined (__ICCARM__)) ||(defined (__GNUC__)) || defined (__TASKING__) )
+#if defined (ARM_MATH_CM0_FAMILY) && ((defined (__ICCARM__)) ||(defined (__GNUC__)) || defined (__TASKING__) ) && !defined (__CC_ARM)
 
   static __INLINE uint32_t __CLZ(
   q31_t data);

libraries/mbed/targets/cmsis/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32HG_STK3400/TOOLCHAIN_ARM_STD/startup_efm32hg.s

@@ -224,7 +224,6 @@ typedef enum IRQn
 
 /** @} End of group EFM32HG322F64_Part */
 
-#define ARM_MATH_CM0PLUS
 #include "arm_math.h"       /* To get __CLZ definitions etc. */
 #include "core_cm0plus.h"   /* Cortex-M0+ processor and core peripherals */
 #include "system_efm32hg.h" /* System Header */