Move math helpers to lj_vmmath.c. Add missing log2/exp2 for Symbian.

src/buildvm_x64win.h

@@ -876,7 +876,7 @@ enum {
   GLOB_ff_math_log,
   GLOB_ff_math_log10,
   GLOB_ff_math_exp,
-  GLOB_vm_exp,
+  GLOB_vm_exp_x87,
   GLOB_ff_math_sin,
   GLOB_ff_math_cos,
   GLOB_ff_math_tan,
@@ -936,7 +936,7 @@ enum {
   GLOB_vm_ceil_sse,
   GLOB_vm_trunc_sse,
   GLOB_vm_mod,
-  GLOB_vm_exp2,
+  GLOB_vm_exp2_x87,
   GLOB_vm_exp2raw,
   GLOB_vm_pow_sse,
   GLOB_vm_powi_sse,
@@ -1037,7 +1037,7 @@ static const char *const globnames[] = {
   "ff_math_log",
   "ff_math_log10",
   "ff_math_exp",
-  "vm_exp",
+  "vm_exp_x87",
   "ff_math_sin",
   "ff_math_cos",
   "ff_math_tan",
@@ -1097,7 +1097,7 @@ static const char *const globnames[] = {
   "vm_ceil_sse",
   "vm_trunc_sse",
   "vm_mod",
-  "vm_exp2",
+  "vm_exp2_x87",
   "vm_exp2raw",
   "vm_pow_sse",
   "vm_powi_sse",
@@ -1128,9 +1128,9 @@ static const char *const extnames[] = {
   "lj_tab_next",
   "lj_tab_getinth@8",
   "lj_ffh_coroutine_wrap_err@8",
-  "lj_wrapper_sinh",
-  "lj_wrapper_cosh",
-  "lj_wrapper_tanh",
+  "lj_vm_sinh",
+  "lj_vm_cosh",
+  "lj_vm_tanh",
   "lj_str_new",
   "lj_tab_len@4",
   "lj_gc_step@4",