Bug 1513725 - fix xptcall stubs for aarch64 for bool params, r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D17252

--HG--
extra : moz-landing-system : lando

xpcom/reflect/xptcall/md/unix/xptcstubs_aarch64.cpp

@@ -152,9 +152,9 @@ PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args,
 
             case nsXPTType::T_BOOL:
                 if (next_gpr < PARAM_GPR_COUNT) {
-                    dp->val.b  = (bool)gprData[next_gpr++];
+                    dp->val.b  = (bool)(uint8_t)gprData[next_gpr++];
                 } else {
-                    dp->val.b  = (bool)*ap++;
+                    dp->val.b  = (bool)(uint8_t)*ap++;
                 }
                 break;
 

xpcom/reflect/xptcall/md/win32/xptcstubs_aarch64.cpp

@@ -150,9 +150,9 @@ PrepareAndDispatch(nsXPTCStubBase* self, uint32_t methodIndex, uint64_t* args,
 
             case nsXPTType::T_BOOL:
                 if (next_gpr < PARAM_GPR_COUNT) {
-                    dp->val.b  = (bool)gprData[next_gpr++];
+                    dp->val.b  = (bool)(uint8_t)gprData[next_gpr++];
                 } else {
-                    dp->val.b  = (bool)*ap++;
+                    dp->val.b  = (bool)(uint8_t)*ap++;
                 }
                 break;