tcg: Add page_bits and page_mask to TCGContext

Disconnect guest page size from TCG compilation.
While this could be done via exec/target_page.h, we want to cache
the value across multiple memory access operations, so we might
as well initialize this early.

The changes within tcg/ are entirely mechanical:

    sed -i s/TARGET_PAGE_BITS/s->page_bits/g
    sed -i s/TARGET_PAGE_MASK/s->page_mask/g

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/riscv/tcg-target.c.inc

@@ -937,7 +937,7 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, TCGReg *pbase,
     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP1, TCG_AREG0, table_ofs);
 
     tcg_out_opc_imm(s, OPC_SRLI, TCG_REG_TMP2, addr_reg,
-                    TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
+                    s->page_bits - CPU_TLB_ENTRY_BITS);
     tcg_out_opc_reg(s, OPC_AND, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP0);
     tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP1);
 
@@ -952,7 +952,7 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, TCGReg *pbase,
         tcg_out_opc_imm(s, TARGET_LONG_BITS == 32 ? OPC_ADDIW : OPC_ADDI,
                         addr_adj, addr_reg, s_mask - a_mask);
     }
-    compare_mask = TARGET_PAGE_MASK | a_mask;
+    compare_mask = s->page_mask | a_mask;
     if (compare_mask == sextreg(compare_mask, 0, 12)) {
         tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_TMP1, addr_adj, compare_mask);
     } else {