Merge pull request #419 from dbrotz/fix-blackslash-tab-at-eof

Handle tabs after backslash at end of file

test/asm/line-continuation-macro.asm

@@ -0,0 +1,7 @@
+m: MACRO
+ENDM
+
+m2: MACRO
+	m \ ENDM
+
+	m2

test/asm/line-continuation-rept.asm

@@ -0,0 +1,8 @@
+m: MACRO
+ENDM
+
+REPT 1
+	m ENDR
+
+REPT 1
+	m \ ENDR

test/asm/line-continuation-whitespace.asm

@@ -0,0 +1,7 @@
+; Test that \ followed by whitespace after a macro invocation at the end of the
+; file doesn't cause a segfault.
+
+bar: MACRO
+ENDM
+
+foo bar baz\