[libclc] Fix unresolved reference to missing table (llvm#133691)

Splitting the 'ln_tbl' into two in db98e29 wasn't done thoroughly
enough as some references to the old table still remained. This commit
fixes the unresolved references by updating to the new split table.

Author: frasercrmck

libclc/clc/include/clc/math/tables.h

@@ -78,7 +78,6 @@ CLC_TABLE_FUNCTION_DECL(float, exp_tbl_ep_tail);
 
 #pragma OPENCL EXTENSION cl_khr_fp64 : enable
 
-TABLE_FUNCTION_DECL(double2, ln_tbl);
 CLC_TABLE_FUNCTION_DECL(double, ln_tbl_lo);
 CLC_TABLE_FUNCTION_DECL(double, ln_tbl_hi);
 CLC_TABLE_FUNCTION_DECL(double, atan_jby256_tbl_head);

libclc/clc/lib/generic/math/clc_log_base.h

@@ -261,9 +261,8 @@ __clc_log(double x)
   int index = __clc_as_int2(ux).hi >> 13;
   index = ((0x80 | (index & 0x7e)) >> 1) + (index & 0x1);
 
-  double2 tv = USE_TABLE(ln_tbl, index - 64);
-  double z1 = tv.s0;
-  double q = tv.s1;
+  double z1 = USE_TABLE(ln_tbl_lo, index - 64);
+  double q = USE_TABLE(ln_tbl_hi, index - 64);
 
   double f1 = index * 0x1.0p-7;
   double f2 = f - f1;