Enable leak sanitizer for memory leak detection

Previously for sanitizer tests, only address sanitizer is enabled,
in this patch, leak sanitizer is also enabled to detect any possible
memory leak happened in compilation.

Close #275.

Author: ChAoSUnItY

Makefile

@@ -52,8 +52,8 @@ SNAPSHOTS := $(foreach SNAPSHOT_ARCH,$(ARCHS), $(patsubst tests/%.c, tests/snaps
 
 all: config bootstrap
 
-sanitizer: CFLAGS += -fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer -O0
-sanitizer: LDFLAGS += -fsanitize=address -fsanitize=undefined
+sanitizer: CFLAGS += -fsanitize=address -fsanitize=undefined -fsanitize=leak -fno-omit-frame-pointer -O0
+sanitizer: LDFLAGS += -fsanitize=address -fsanitize=undefined -fsanitize=leak
 sanitizer: config $(OUT)/$(STAGE0)-sanitizer
 	$(VECHO) "  Built stage 0 compiler with sanitizers\n"
 

src/ssa.c

@@ -903,8 +903,6 @@ void bb_unwind_phi(func_t *func, basic_block_t *bb)
         for (phi_operand_t *operand = insn->phi_ops; operand;
              operand = operand->next)
             append_unwound_phi_insn(operand->from, insn->rd, operand->var);
-        /* TODO: Release memory allocated for phi instruction to prevent leaks
-         */
     }
 
     bb->insn_list.head = insn;