Fix two assertion fails in JIT found by Karl Skomski.

ChangeLog

@@ -151,6 +151,9 @@ non-zero.
 
 41. Improve first character match in JIT with SSE2 on x86.
 
+42. Fix two assertion fails in JIT. These issues were found by Karl Skomski
+with a custom LLVM fuzzer.
+
 
 Version 10.20 30-June-2015
 --------------------------

src/pcre2_jit_compile.c

@@ -5457,6 +5457,7 @@ sljit_uw typeoffset;
 cc++;
 ccbegin = cc;
 compares = 0;
+
 if (cc[-1] & XCL_MAP)
   {
   min = 0;
@@ -5596,9 +5597,10 @@ else if ((cc[-1] & XCL_MAP) != 0)
   if (!check_class_ranges(common, (const sljit_ub *)cc, FALSE, TRUE, list))
     {
 #if PCRE2_CODE_UNIT_WIDTH == 8
-    SLJIT_ASSERT(common->utf);
+    jump = NULL;
+    if (common->utf)
 #endif
-    jump = CMP(SLJIT_GREATER, TMP1, 0, SLJIT_IMM, 255);
+      jump = CMP(SLJIT_GREATER, TMP1, 0, SLJIT_IMM, 255);
 
     OP2(SLJIT_AND, TMP2, 0, TMP1, 0, SLJIT_IMM, 0x7);
     OP2(SLJIT_LSHR, TMP1, 0, TMP1, 0, SLJIT_IMM, 3);
@@ -5607,7 +5609,10 @@ else if ((cc[-1] & XCL_MAP) != 0)
     OP2(SLJIT_AND | SLJIT_SET_E, SLJIT_UNUSED, 0, TMP1, 0, TMP2, 0);
     add_jump(compiler, list, JUMP(SLJIT_NOT_ZERO));
 
-    JUMPHERE(jump);
+#if PCRE2_CODE_UNIT_WIDTH == 8
+    if (common->utf)
+#endif
+      JUMPHERE(jump);
     }
 
   OP1(SLJIT_MOV, TMP1, 0, RETURN_ADDR, 0);
@@ -10657,7 +10662,7 @@ static SLJIT_INLINE void compile_recurse(compiler_common *common)
 DEFINE_COMPILER;
 PCRE2_SPTR cc = common->start + common->currententry->start;
 PCRE2_SPTR ccbegin = cc + 1 + LINK_SIZE + (*cc == OP_BRA ? 0 : IMM2_SIZE);
-PCRE2_SPTR ccend = bracketend(cc);
+PCRE2_SPTR ccend = bracketend(cc) - (1 + LINK_SIZE);
 BOOL needs_control_head;
 int framesize = get_framesize(common, cc, NULL, TRUE, &needs_control_head);
 int private_data_size = get_private_data_copy_length(common, ccbegin, ccend, needs_control_head);

testdata/testinput17

@@ -247,4 +247,6 @@
 /[^\xff]((?1))/BI
     abcd
 
+/(x(?1)){4}/
+
 # End of testinput17

testdata/testinput5

@@ -1659,4 +1659,7 @@
 /\C(\W?ſ)'?{{/utf
     \\C(\\W?ſ)'?{{
 
+/[\pS#moq]/
+    =
+
 # End of testinput5 

testdata/testoutput17

@@ -481,4 +481,6 @@ JIT compilation was successful
     abcd
 Failed: error -46: JIT stack limit reached
 
+/(x(?1)){4}/
+
 # End of testinput17

testdata/testoutput5

@@ -4060,4 +4060,8 @@ No match
     \\C(\\W?ſ)'?{{
 No match
 
+/[\pS#moq]/
+    =
+ 0: =
+
 # End of testinput5