remove the ExecutionEngine binding

the code has no tests and will just bitrot by itself.

this is a [breaking-change]

Author: arielb1

mk/rustllvm.mk

@@ -24,7 +24,7 @@ LLVM_EXTRA_INCDIRS_$(1)= $$(call CFG_CC_INCLUDE_$(1),$(S)src/llvm/include) \
 endif
 
 RUSTLLVM_OBJS_CS_$(1) := $$(addprefix rustllvm/, \
-	ExecutionEngineWrapper.cpp RustWrapper.cpp PassWrapper.cpp \
+	RustWrapper.cpp PassWrapper.cpp \
 	ArchiveWrapper.cpp)
 
 RUSTLLVM_INCS_$(1) = $$(LLVM_EXTRA_INCDIRS_$(1)) \

src/librustc_llvm/build.rs

@@ -112,8 +112,7 @@ fn main() {
         cfg.flag(&flag);
     }
 
-    cfg.file("../rustllvm/ExecutionEngineWrapper.cpp")
-       .file("../rustllvm/PassWrapper.cpp")
+    cfg.file("../rustllvm/PassWrapper.cpp")
        .file("../rustllvm/RustWrapper.cpp")
        .file("../rustllvm/ArchiveWrapper.cpp")
        .cpp(true)

src/librustc_llvm/lib.rs

@@ -1099,15 +1099,6 @@ extern {
                                          Name: *const c_char);
     pub fn LLVMDisposeBuilder(Builder: BuilderRef);
 
-    /* Execution engine */
-    pub fn LLVMBuildExecutionEngine(Mod: ModuleRef) -> ExecutionEngineRef;
-    pub fn LLVMDisposeExecutionEngine(EE: ExecutionEngineRef);
-    pub fn LLVMExecutionEngineFinalizeObject(EE: ExecutionEngineRef);
-    pub fn LLVMRustLoadDynamicLibrary(path: *const c_char) -> Bool;
-    pub fn LLVMExecutionEngineAddModule(EE: ExecutionEngineRef, M: ModuleRef);
-    pub fn LLVMExecutionEngineRemoveModule(EE: ExecutionEngineRef, M: ModuleRef)
-                                           -> Bool;
-
     /* Metadata */
     pub fn LLVMSetCurrentDebugLocation(Builder: BuilderRef, L: ValueRef);
     pub fn LLVMGetCurrentDebugLocation(Builder: BuilderRef) -> ValueRef;