merge(glittershark/achilles): Subtree import at 'b93268085a'

Imported from https://github.com/glittershark/achilles/

git-subtree-dir: users/glittershark/achilles
git-subtree-mainline: 4d193f2395
git-subtree-split: b93268085a
Change-Id: I64a583b454bbe03e20358ad7808939a4cbc212ba

users/glittershark/achilles/ach/.gitignore

@@ -0,0 +1,5 @@
+*.ll
+*.o
+
+functions
+simple

users/glittershark/achilles/ach/Makefile

@@ -0,0 +1,15 @@
+default: simple
+
+%.ll: %.ach
+	cargo run -- compile $< -o $@ -f llvm
+
+%.o: %.ll
+	llc $< -o $@ -filetype=obj
+
+%: %.o
+	clang $< -o $@
+
+.PHONY: clean
+
+clean:
+	@rm -f *.ll *.o simple functions

users/glittershark/achilles/ach/functions.ach

@@ -0,0 +1,3 @@
+fn id x = x
+fn plus (x: int) (y: int) = x + y
+fn main = plus (id 2) 7

users/glittershark/achilles/ach/simple.ach

@@ -0,0 +1 @@
+fn main = let x = 2; y = 3 in x + y