add gi_c, a minimal C go interpreter POC

.gitignore

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+.*.swp
+gi_c/*.o
+gi_c/gi
+gi_c/loop2
+gi_c/l2
+gi_c/deps/lightning-*
+gi_c/deps/lib
+gi_c/deps/include
+gi_c/deps/share
+gi_c/deps/*.gz

gi_c/README.md

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+# gi_c
+
+Proof of concept for a go interpreter, using previous private works
+
+# Install
+
+dependencies: graphviz for AST / CFG visualization
+
+```
+make
+make test
+```
+
+# Notes
+
+Language scope is very limited, just enough to run the demo script `loop2.go`. Interesting enough to get an idea of performances compared with binaries, with or without JIT compilation.
+
+the machine code generator is using GNU-lightning (installed with `make deps`).
+
+Do not expect many improvements here, the real work will take place in Go, and will try to reuse as much as possible existing Go assets.
+
+--
+Marc

gi_c/l2.go

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+package main
+
+func main() {
+	for a := 0; a < 20000; a++ {
+		if (a & 0x8ff) == 0x800 {
+			println(a)
+		}
+	}
+}

gi_c/loop2.go

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+package main
+
+func main() {
+	for a := 0; a < 2000000000; a++ {
+		if (a & 0x8ffff) == 0x80000 {
+			println(a)
+		}
+	}
+}

gi_c/t1.go

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+a = 1
+a++
+b--