Add some prototypes to these functions; NFC

This is expected to fix the issues in this build bot:
https://lab.llvm.org/buildbot/#/builders/37/builds/12312

Author: AaronBallman

compiler-rt/lib/builtins/cpu_model.c

@@ -149,7 +149,7 @@ enum ProcessorFeatures {
 // Check motivated by bug reports for OpenSSL crashing on CPUs without CPUID
 // support. Consequently, for i386, the presence of CPUID is checked first
 // via the corresponding eflags bit.
-static bool isCpuIdSupported() {
+static bool isCpuIdSupported(void) {
 #if defined(__GNUC__) || defined(__clang__)
 #if defined(__i386__)
   int __cpuid_supported;

compiler-rt/lib/builtins/emutls.c

@@ -93,7 +93,7 @@ static __inline void emutls_setspecific(emutls_address_array *value) {
   pthread_setspecific(emutls_pthread_key, (void *)value);
 }
 
-static __inline emutls_address_array *emutls_getspecific() {
+static __inline emutls_address_array *emutls_getspecific(void) {
   return (emutls_address_array *)pthread_getspecific(emutls_pthread_key);
 }
 
@@ -125,9 +125,9 @@ static __inline void emutls_init_once(void) {
   pthread_once(&once, emutls_init);
 }
 
-static __inline void emutls_lock() { pthread_mutex_lock(&emutls_mutex); }
+static __inline void emutls_lock(void) { pthread_mutex_lock(&emutls_mutex); }
 
-static __inline void emutls_unlock() { pthread_mutex_unlock(&emutls_mutex); }
+static __inline void emutls_unlock(void) { pthread_mutex_unlock(&emutls_mutex); }
 
 #else // _WIN32
 
@@ -209,16 +209,16 @@ static __inline void emutls_init_once(void) {
   InitOnceExecuteOnce(&once, emutls_init, NULL, NULL);
 }
 
-static __inline void emutls_lock() { EnterCriticalSection(emutls_mutex); }
+static __inline void emutls_lock(void) { EnterCriticalSection(emutls_mutex); }
 
-static __inline void emutls_unlock() { LeaveCriticalSection(emutls_mutex); }
+static __inline void emutls_unlock(void) { LeaveCriticalSection(emutls_mutex); }
 
 static __inline void emutls_setspecific(emutls_address_array *value) {
   if (TlsSetValue(emutls_tls_index, (LPVOID)value) == 0)
     win_abort(GetLastError(), "TlsSetValue");
 }
 
-static __inline emutls_address_array *emutls_getspecific() {
+static __inline emutls_address_array *emutls_getspecific(void) {
   LPVOID value = TlsGetValue(emutls_tls_index);
   if (value == NULL) {
     const DWORD err = GetLastError();

compiler-rt/lib/builtins/fp_mode.c

@@ -15,8 +15,8 @@
 #include "fp_mode.h"
 
 // IEEE-754 default rounding (to nearest, ties to even).
-CRT_FE_ROUND_MODE __fe_getround() { return CRT_FE_TONEAREST; }
+CRT_FE_ROUND_MODE __fe_getround(void) { return CRT_FE_TONEAREST; }
 
-int __fe_raise_inexact() {
+int __fe_raise_inexact(void) {
   return 0;
 }