Add .gitignore

Author: dstogov

ext/opcache/jit/ir/.gitignore

@@ -0,0 +1,21 @@
+*.o
+*.log
+*.dot
+*.pdf
+ir_fold_hash.h
+ir_emit_x86.h
+ir_emit_aarch64.h
+minilua
+gen_ir_fold_hash
+ir_test
+ir
+b.c
+
+tests/**/*.diff
+tests/**/*.exp
+tests/**/*.ir
+tests/**/*.out
+tests/**/*.log
+
+win32/vcpkg
+win32/build_*