inline the one method getlhs (#315)

Author: KristofferC

src/commands.jl

@@ -65,7 +65,7 @@ function finish_stack!(@nospecialize(recurse), frame::Frame, rootistoplevel::Boo
         frame.callee = nothing
         pc = frame.pc
         if isassign(frame, pc)
-            lhs = getlhs(pc)
+            lhs = SSAValue(pc)
             do_assignment!(frame, lhs, ret)
         else
             stmt = pc_expr(frame, pc)

src/interpret.jl

@@ -1,7 +1,5 @@
 # Implements a simple interpreter for julia's lowered AST
 
-getlhs(pc) = SSAValue(pc)
-
 isassign(frame) = isassign(frame, frame.pc)
 isassign(frame, pc) = (pc in frame.framecode.used)
 
@@ -352,7 +350,7 @@ function maybe_assign!(frame, @nospecialize(stmt), @nospecialize(val))
         lhs = stmt.args[1]
         do_assignment!(frame, lhs, val)
     elseif isassign(frame, pc)
-        lhs = getlhs(pc)
+        lhs = SSAValue(pc)
         do_assignment!(frame, lhs, val)
     end
     return nothing
@@ -538,7 +536,7 @@ function step_expr!(@nospecialize(recurse), frame, @nospecialize(node), istoplev
         if !@isdefined(rhs)
             @show frame node
         end
-        lhs = getlhs(pc)
+        lhs = SSAValue(pc)
         do_assignment!(frame, lhs, rhs)
     end
     return (frame.pc = pc + 1)

test/utils.jl

@@ -1,7 +1,7 @@
 using JuliaInterpreter
 using JuliaInterpreter: Frame, @lookup
 using JuliaInterpreter: finish_and_return!, evaluate_call!, step_expr!, shouldbreak,
-                        do_assignment!, getlhs, isassign, pc_expr, handle_err, get_return,
+                        do_assignment!, SSAValue, isassign, pc_expr, handle_err, get_return,
                         moduleof, prepare_thunk
 using Base.Meta: isexpr
 using Test, Random, SHA
@@ -64,7 +64,7 @@ function evaluate_limited!(@nospecialize(recurse), frame::Frame, nstmts::Int, is
                 try
                     rhs = evaluate_call!(limexec!, frame, stmt)
                     isa(rhs, Aborted) && return rhs, refnstmts[]
-                    lhs = getlhs(pc)
+                    lhs = SSAValue(pc)
                     do_assignment!(frame, lhs, rhs)
                     new_pc = pc + 1
                 catch err