Remove unused code

Author: jserv

src/lexer.c

@@ -150,11 +150,6 @@ bool is_whitespace(char c)
 
 char peek_char(int offset);
 
-/* is it backslash-newline? */
-bool is_linebreak(char c)
-{
-    return c == '\\' && peek_char(1) == '\n';
-}
 
 bool is_newline(char c)
 {

src/riscv.c

@@ -377,15 +377,6 @@ int __ecall(void)
     return rv_encode_I(rv_ecall, __zero, __zero, 0);
 }
 
-int __ebreak(void)
-{
-    return rv_encode_I(rv_ebreak, __zero, __zero, 1);
-}
-
-int __nop(void)
-{
-    return __addi(__zero, __zero, 0);
-}
 
 int __mul(rv_reg rd, rv_reg rs1, rv_reg rs2)
 {