Change cached powers of 10 to avoid constants that need a static

src/cached-powers.cc

Index: src/cached-powers.cc
===================================================================
--- src/cached-powers.cc	(revision 9537)
+++ src/cached-powers.cc	(working copy)
@@ -134,14 +134,12 @@
 };
 
 static const int kCachedPowersLength = ARRAY_SIZE(kCachedPowers);
-static const int kCachedPowersOffset = -kCachedPowers[0].decimal_exponent;
+static const int kCachedPowersOffset = 348;  // -1 * the first decimal_exponent.
 static const double kD_1_LOG2_10 = 0.30102999566398114;  //  1 / lg(10)
-const int PowersOfTenCache::kDecimalExponentDistance =
-    kCachedPowers[1].decimal_exponent - kCachedPowers[0].decimal_exponent;
-const int PowersOfTenCache::kMinDecimalExponent =
-    kCachedPowers[0].decimal_exponent;
-const int PowersOfTenCache::kMaxDecimalExponent =
-    kCachedPowers[kCachedPowersLength - 1].decimal_exponent;
+// Difference between the decimal exponents in the table above.
+const int PowersOfTenCache::kDecimalExponentDistance = 8;
+const int PowersOfTenCache::kMinDecimalExponent = -348;
+const int PowersOfTenCache::kMaxDecimalExponent = 340;
 
 void PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
     int min_exponent,